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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <atomic>
#include <bitset>
#include <list>
#include <mutex>
#include <queue>
#include <thread>
#include <vector>
#include <android-base/thread_annotations.h>
#include "LogBuffer.h"
#include "LogReaderList.h"
#include "LogStatistics.h"
#include "LogTags.h"
#include "LogdLock.h"
#include "SerializedLogChunk.h"
#include "SerializedLogEntry.h"
class SerializedLogBuffer final : public LogBuffer {
public:
// Create SerializedLogChunk's with size = max_size_[log_id] / kChunkSizeDivisor.
static constexpr size_t kChunkSizeDivisor = 4;
SerializedLogBuffer(LogReaderList* reader_list, LogTags* tags, LogStatistics* stats);
void Init() override;
int Log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, const char* msg,
uint16_t len) override;
std::unique_ptr<FlushToState> CreateFlushToState(uint64_t start, LogMask log_mask)
REQUIRES(logd_lock) override;
bool FlushTo(LogWriter* writer, FlushToState& state,
const std::function<FilterResult(log_id_t log_id, pid_t pid, uint64_t sequence,
log_time realtime)>& filter)
REQUIRES(logd_lock) override;
bool Clear(log_id_t id, uid_t uid) override;
size_t GetSize(log_id_t id) override;
bool SetSize(log_id_t id, size_t size) override;
uint64_t sequence() const override { return sequence_.load(std::memory_order_relaxed); }
private:
bool ShouldLog(log_id_t log_id, const char* msg, uint16_t len);
void MaybePrune(log_id_t log_id) REQUIRES(logd_lock);
void Prune(log_id_t log_id, size_t bytes_to_free) REQUIRES(logd_lock);
void UidClear(log_id_t log_id, uid_t uid) REQUIRES(logd_lock);
void RemoveChunkFromStats(log_id_t log_id, SerializedLogChunk& chunk);
size_t GetSizeUsed(log_id_t id) REQUIRES(logd_lock);
LogReaderList* reader_list_;
LogTags* tags_;
LogStatistics* stats_;
size_t max_size_[LOG_ID_MAX] GUARDED_BY(logd_lock) = {};
std::list<SerializedLogChunk> logs_[LOG_ID_MAX] GUARDED_BY(logd_lock);
std::atomic<uint64_t> sequence_ = 1;
};
// Exposed for testing.
void ClearLogsByUid(std::list<SerializedLogChunk>& log_buffer, uid_t uid, size_t max_size,
log_id_t log_id, LogStatistics* stats);
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